Well, that was something I was unprepared for. We practiced our presentation a couple of times, were all set, and then about 5 minutes into our talk, we hear a "click" and the projector goes out. Never to come on again. We adapted as best we could, but explaining crypto without any symbols on the display is never all that easy. And then we had to do our demo in interpretive dance (almost). But we did get lots of questions, so all's well that ends well.